Had it not been for the fact that Eisele damaged his shoulder during a zero-G training flight aboard a KC-135 aircraft just before Christmas 1965, he might have been in the senior pilot’s seat aboard Apollo 1, instead of Ed White.

Some significant goals had been set for the last two Gemini flights. For example, the Apollo Spacecraft Program Office wanted a rendezvous in the first spacecraft orbit, which would simulate lunar orbit rendezvous. There was also interest in linking an Agena to a the Gemini spacecraft by a tether and then spinning the combination to produce some artificial gravity.